Digester



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UNITED STATES PATENT OFFICE.

EueEn MEUREE, or PALMER, NEW YORK.

DIGESTER.

SPECIFICATION forming part of Letters Patent No. 514,374, dated February 6, 1894.

Application filed December 30, 1892. Serial No. 456,762. (No model.)

To @ZZ whom it may concern.- Be it known that l, EUGEN MEURER, a sub- Ject of the Emperor of Germany, residing at Palmer, in the county of Saratoga and State of New York, have invented a new and useful Improvement in Digesters, of which the following is a correct description, reference being had to the accompanying drawings.

The present invention relates to the mode of supporting the lead lining of a boiler or dlgester such as is used in the manufacture of Wood pulp and in various others of the arts. The shell of these digesters or boilers is usually constructed of iron or steel, andin order to protectthe metal composing the shell from contact with the acids employed in the various operations for which the vessel is used,

itis common to line it with lead. Various modes have been practiced heretofore for securing this lead lining to the inner face of the shell. One method has been to secure the sheets of lead to the metal shell by means of rivets or lugsl By other methods the lead is fastened to the shell by tar or pitch, or by the lead being melted on, or fused directly to the surface of the metal shell, or by the lead being secured to the shell by a cement interposed between the lead and the shell. One difficulty with these modes of securing the lead lining to the shell of the digester is the liability ot' the lining to be detached at points from its fastenings and to buckle and crack by reason of the dierence in the coefficient of expansion between the two metals.

rlhis opens seams .which permit the liquors of the vessel to penetrate into the space-behind the lining and thus reach the metal shell.

The present invention seeks to provide the digester with a lead lining which shall be free from the diiculty mentioned; and to this end I propose to mold sheets of lead against the inner face of the shell of the digester and fuse the edges oi' these sheets together so as to form one 4continuous sheet in intimate contact with the shell, and without the use of cement or of rivets for attaching such lining to the shell. This leaves the lead lining comparatively unaected by the motions of contraction and expansion imparted to the metal shell by changes of temperature. An interior lining of acid-proof brick built up against the lead lining will operate to protect this latter lining from collapse whenever the digester is blown out.

The invention is illustrated in the accompanying drawings, in which- Figure 1 is a vertical section of the digester, only a portion, however, of the brick lining being shown, and Fig. 2 is a horizontal crosssection on line of Fig. l.

The steel shell is represented byA; the lead lining by B; the acid-proof brick by C.

D, E E, and F F represent a framework which is employed in constructing the lining, in the manner hereinafter set forth.

In lining a digester on the plan of my invention, it will be found most convenient to lay the shell upon its side for the purpose of applying the sheets of lead to the inner face thereof, and as the sheets are applied they may be held in place by wood blocks F, which in turn are supported by the braces E, which rest against or are inserted in the central post D. As the sheets are placed in position heat is applied to the edges in contact, sufficient to fuse the edges together, until by this process the entire inner surface of the shell is covered, in close contact, by a seamless sheet of lead. The digester may now be lifted into an upright position and the acidproof blocks or bricks C put in position. ing of brick will, of course, be started at the base of the digester and be built upward; and as this work goes on the blocks F, together with the corresponding props E, will be removed until at last the brick lining will extend over the entire face of the lead lining. This mode of lining a boiler or digester is intended primarily for such as are used in the manufacture of wood pulp, but it is manifest that it will be useful also in those vessels or boilers which are employed in the other arts in which a strong outer shell has to be provided with a lining of lead.

What is claimed as new is- The combination with the outer shell of a pulp digester or similar vessel of a lead lining littcd as a continuons sheet against the inner face of the shell and an inner lining of acid-proof blocks fitted against the lead lining.

EUGEN MEURER. Witnesses:

Roer. F. GAYLORD, ERNEST I-lorKINsoN.

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